Vacuum-insulated flask



FIG. 1 is a perspective view of my new vacuum-insulated flask;

FIG. 2 is a side view thereof, the flask being radially symmetrical about a vertical axis;

FIG. 3 is a top view thereof; and,

FIG. 4 is a bottom view thereof. 

CLAIM The ornamental design for a vacuum-insulated flask, as shown and described. 